Multiple carrier frequency offsets estimation in cooperative networks: An experimental study
A. Raza, Amna Aziz, Syed Muhammad Ali Qasim Naqvi, Syed Ali Hassan, Ali A. Nasir · 2017
Cooperative spatial diversity allows for more robust wireless networks with higher capacity and data rates. These diversity gains, however, diminish with the multiple carrier frequency offsets (CFOs) that arise due to distributed transmissions over independent channels. A number of techniques have been proposed for multiple CFO estimation, however, their empirical performance remains to be analyzed. This paper seeks to experimentally analyze the performance of the iterative MUltiple SIgnal Characterization (I-MUSIC) algorithm for decode-and-forward (DF) relaying on the universal software radio peripheral (USRP) platforms. The results show that the aforementioned algorithm performs reasonably well, in both line-of-sight (LoS) and non-line-of-sight (NLoS) channels, in terms of mean squared error (MSE) of the estimated CFOs. However, the performance margin greatly depends on the type of environment and the number of data symbols used for estimation.